How to increase toolbar title text size in android

In this android programming source code example, we are going to explore how to increase toolbar title text size in android.

Below is a step by step source code to increase toolbar title text size in android.

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    tools:context=".toolbar.Toolbar4">

    <android.support.v7.widget.Toolbar
        android:id="@+id/toolbar_top"
        android:layout_height="wrap_content"
        android:layout_width="match_parent"
        android:minHeight="?attr/actionBarSize"
        android:background="@color/colorAccent"
        app:titleTextAppearance="@style/CustomText"
        app:popupTheme="@style/AppTheme.PopupOverlay"  >

    </android.support.v7.widget.Toolbar>

</android.support.design.widget.CoordinatorLayout>

MainActivity.java

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.Toolbar;

public class Toolbar4 extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_toolbar4);

        Toolbar toolbar = findViewById(R.id.toolbar_top);
        toolbar.setTitle("Custom Text Size");
        toolbar.setTitleTextAppearance(this, R.style.CustomText);
        setSupportActionBar(toolbar);
    }
}

styles.xml

<style name="CustomText" parent="@style/Base.TextAppearance.AppCompat.Title">
        <item name="android:textSize">28sp</item>
</style>

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